Probability change

Suppose i have a set [A,B,C]
Probability of A =10% B=40% C=50%
If probability of C lowers to 25%, how the remainder value is distributed(proportionaly)?
I know it suppose to get like 15(+50%),60(+50%),25 but what if the set grows?
exmaple       5,77,3,15(-5) becomes 6.65,102,4,10
I'm looking for a formula for arbitrary sets of probability(not just 3).

>>10
Ah, OK then.

I don't quite get why you need to adjust intervals as such. You get your matrix of probabilities from counting letter combinations in the wild, I assume, so why not alter those counts directly?

Also, are you sure that manually adjusting some of the about 20000 weights will have any noticeable effect? What do you mean that this can be done "by file input", do you actually have no idea that you're supposed to construct the probability matrix from file input directly?